[PATCH v4] media: atomisp: gc2235: fix UAF and memory leak

Yuho Choi
2026-04-03T00:23:26Z

gc2235_probe() handles its error paths incorrectly.

If media_entity_pads_init() fails, gc2235_remove() is called, which
tears down the subdev and frees dev, but then still falls through to
atomisp_register_i2c_module(). This results in use-after-free.

If atomisp_register_i2c_module() fails, the media entity and control
handler are left initialized and dev is leaked.

gc2235_remove() unconditionally calls media_entity_cleanup() and
v4l2_ctrl_handler_free(), but these are not initialized at every
error path in gc2235_probe().

Replace gc2235_remove() calls in the probe error paths with explicit
unwind labels that free only the resources initialized at each point
of failure, in reverse order of initialization.

Fixes: a49d25364dfb ("staging/atomisp: Add support for the Intel IPU v2")
Signed-off-by: Yuho Choi <dbgh9129@gmail.com>
---
Changes since v3:
- Replaced goto out_free/gc2235_remove() with explicit unwind labels
to release only initialized resources at each failure point
- Replaced the "Fixes" tag with the original commit for the driver

Changes since v2:
- Replaced gc2235_remove() calls in remaining two error paths with
goto labels to unwind only initialized resources
- Added Fixes tag

Changes since v1:
- Edited the commit message to be imperative mood
- Corrected the previous mangled patch

.../media/atomisp/i2c/atomisp-gc2235.c | 29 ++++++++++++-------
1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c b/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c
index d3414312e1de2..998c9f46bd068 100644
--- a/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c
+++ b/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c
@@ -809,7 +809,7 @@ static int gc2235_probe(struct i2c_client *client)

ret = gc2235_s_config(&dev->sd, client->irq, gcpdev);
if (ret)
- goto out_free;
+ goto err_unregister_subdev;

dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
dev->pad.flags = MEDIA_PAD_FL_SOURCE;
@@ -818,18 +818,16 @@ static int gc2235_probe(struct i2c_client *client)
ret =
v4l2_ctrl_handler_init(&dev->ctrl_handler,
ARRAY_SIZE(gc2235_controls));
- if (ret) {
- gc2235_remove(client);
- return ret;
- }
+ if (ret)
+ goto err_csi_cfg;

for (i = 0; i < ARRAY_SIZE(gc2235_controls); i++)
v4l2_ctrl_new_custom(&dev->ctrl_handler, &gc2235_controls[i],
NULL);

if (dev->ctrl_handler.error) {
- gc2235_remove(client);
- return dev->ctrl_handler.error;
+ ret = dev->ctrl_handler.error;
+ goto err_ctrl_handler;
}

/* Use same lock for controls as for everything else. */
@@ -838,14 +836,23 @@ static int gc2235_probe(struct i2c_client *client)

ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
if (ret)
- gc2235_remove(client);
+ goto err_ctrl_handler;
+
+ ret = atomisp_register_i2c_module(&dev->sd, gcpdev);
+ if (ret)
+ goto err_media_cleanup;

- return atomisp_register_i2c_module(&dev->sd, gcpdev);
+ return 0;

-out_free:
+err_media_cleanup:
+ media_entity_cleanup(&dev->sd.entity);
+err_ctrl_handler:
+ v4l2_ctrl_handler_free(&dev->ctrl_handler);
+err_csi_cfg:
+ dev->platform_data->csi_cfg(&dev->sd, 0);
+err_unregister_subdev:
v4l2_device_unregister_subdev(&dev->sd);
kfree(dev);
-
return ret;
}

--
2.50.1 (Apple Git-155)